Furnace.



J. K-AUTH.

FURNACE.

APPLICATION FILED FEB. 27, 1909.

1,028,572, Patented June 4, 1912.

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FURNACE. APPLIOATION IILED FEB. 27, 1909;

Patented June 4; 1912.

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J. KAUTH.

FURNACE. V

APPLIOATION FILED FEB. 27, 1909.

1,028,572. Patented June 4, 1912.

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COLUMBIA PLANOGRAPH c0.. wAsmNu'r'oN. D. c.

J.KAUTH FURNACE.

APPLICATION FILED FEB. 27, 1909.

Patented June 4, 1912.

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COLUMBIA FLANOGRAPH CO.,\VASHINGTUN, D. c,

JOHANNES KAUTH, or WIESIBADEN, GERMANY.

FunnAoE.

Specification of Letters I'atent.

Patented June 4, 1912.

Application filed February 27, 1909. Serial No. 480,340.

To all whom it may concern:

Be it known that I, J OHANNES KAUTH, a subject of the German'Emperor, and resident of Wiesbaden, Germany, have invented certain new and useful Improvements in Furnaces, of which the following is a specification.

This invention relates to furnaces, and has for its object to provide means for feeding preheated air to the unconsumed gases and smoke in a combustion chamber placed in rear of the grate bars which arrangement causes said unconsumed gases and smoke to burn with an intense heat when mixed with the preheated air, which latter is fed to said gases and smoke with greater or lesser abundance as the conditions require; that is, when fresh fuel is thrown on the grate, the air inlets are opened to their greatest extent and gradually close as the unconsumed gases decrease in quantity as the fuel is consumed.

A particular object of my invention is to arrange at opposite sides of the fuel chamber of a furnace within its heating belt two or more continuous air conduits having atmospheric communication at the forward end of the furnace and extending beyond the fuel chamber at which protruding portion each conduit is formed preferably with inwardly-extending outlets resembling finger openings. These finger outlets empty into the line of passage of the productsof combustion at diametrically opposite sides and this arrangement completely effects an admixture of the heated air and products of combustion attended with the beneficial consumption of all the inflammable fluids directly within the combustion chamber.

With this object in View the invention consists of the novel construction, combina tion and arrangement of parts hereinafter described and claimed and illustrated inthe accompanying drawings, in which Figure 1 is a front elevation of a furnace provided with the improved invention. Fig. 2, a partial sectional view on the line 22 of Fig. 1. Fig. 3 a horizontal sectional view on the line 33 of Fig.v 2. Fig. A a cross sectional view of a modified form of the inventionon the line el4: of Fig. 5, and Fig. 5 a longitudinal sectional view of the same on line 5-5 of Fig. 4E.

In the drawings, a indicates a brick furnace'of the usual type provided with a fire the ash pit in the usual manner.

door 6 unounted on hinges b in a door frame 6 and provided with a handle 6 The ash pit is represented by a and grate bars A separate the fuel chamber A from At the back of the fuel chamber is the bridge wall a from which extends rearward a gas combustion chamber D over which and the fuel chamber A is the top a of the furnace. Formed within the structure of the furnace a are one, two or more air inlet conduits 0, one being shown on each side of the chamher A in the present instance. These conduits extend from the front face of the furnace rearwardly and slightly inclined upwardly beyond the fuel chamber to the combustion chamber D where each conduit '0 is formed with several outlet openings or nozzles d through which fresh air enters said chamber. It will be seen from Fig. 3,

that these nozzles resemble fingers which project inwardly from one end of each conduit 0. These fingers provide openings in a restricted channel formed in the combustion chamber and leading from the bridge wall, and in this restricted channel the heated air and products of combustion mix before expanded. The finger outlets of each conduit are diametrically opposite and from each outlet the heated air currents issue by jets into the line of passage of the products of combustion along the restricted channel. The inlet openings of the channels o are adapted to be closed by sliding gates e mounted in grooved ways 6 attached to the furnace front a. Each gateeis jointed on the lower end of a rod f slidable in guides f, said rods being pivoted each to a lever f journaled at F. The opposite or inner ends of said levers f are pivoted on the upper end of a vertical rod 9, movable in guides g, and provided with a handle 9 which, when drawn down rocks the levers f and raises the gates 6 thus opening the inlets to the channel 0.

A recess I is formed in the furnace front within which is the doorband ash pit opening. Pivotally mounted at the top of the recess I is a horizontal rocking lever 6 connected'at one end with the lower end of the rod g, and bent at its other end in the form of a hook lying in front of the door b when the rod 9 is raised and said door I) with the parts in the position shown, the door I) cannot be opened until the rod 9 is drawn down to tilt the lever i and raise the hook 2" above the edge of the door. same movement of the lever g raises the gates e and opens the fines or channels 0 into which the cold air enters and becomes heated by the side walls of the chamber before it makes its exit through the nozzles (Z into the combustion chamber D. After filling the chamber A with coal, a great deal of the gases and smoke escape unconsumed into the combustion chamber where said gases commingle with the preheated air entering through the nozzles (Z and is supplied with oxygen, thus causing the gases to burn instead of escaping through the stack.

To regulate the descent of the gates e, a retarding device it of any well known type may be attached to one of the levers 1 which permits the gates to rise easily but to descend. slowly, thereby gradually reducing the quantity of air entering the combustion chamber as the amount of unburned gases decrease due to the more perfect combustion of fuel in the fuel chamber.

In the modified structure illustrated in Figs. 4 and 5, which is intended to be employed in large boilers, the bridge wall K is formed of bricks is, each having a curved or angular chamber therein. The inlet openings to said chambers are in their under sides and their outlets subdivided into two or more nozzles 70 in the rear vertical faces of the bricks. The bridge wall K is supported on a transverse trunk L having two passages Z, Z therein separated by a partition Z having an opening Z therethrough. The front of the furnace is provided on its inner side with a box or chamber M into which air enters through an opening m in the furnace front guarded by arocking door m. Between the trunk L and the box or chamber M is a connecting pipe N, or if desired, two or moresuch pipes may be employed. The grate bars A are supported at opposite ends by the trunk and chamber above the pipe N as shown in Fig. 5. At each end of the bridge wall K is a vertically disposed fire brick 0, which bricks form abutments for a fire brick arch O bearing against the top of the furnace, and each having a curved opening 0 therethrough, which, when assembled, form a passageway for air from the trunk L. The abutment and arch bricks are provided with nozzles 0 for the escape of air into the combustion chamber P. When the door m is opened, air enters the box M and passing through the pipe N flows into the trunk L where it is divided, part flowing along the passage Z to the arch brick openings 0, thence out through the nozzles 0 into the combustion,

chamber. The remainder of the air passes This through the opening Z into the passage Z, and thence through openings Z into the chambers of the bridge wall and out through the nozzles 70 The door m may beregulated by the same mechanism as that shown in the preferred form, and therefore has not been illustrated.

While I have shown one form of my invention herein I do'not wish to be limited to the precise construction shown but intend to cover all modifications and changes chamber, a continuous inlet channel in the furnace wall at each side of and close to the fuel chamber extending from the front face of said brick structure, at one end, beyond the fuel chamber at the other end, said channels inclosed by the combustion chamber at its latter end and. each formed with a plurality of inwardly-extending terminal nozzles.

2. A device of the kind described comprising a casing, a fire-box and an ash-pit intermediate the sides of said casing and spaced inwardly and downwardly from the forward end thereof, a door at one end of said fire-box and a bridge-wall bearing upon its opposite end, an air conduit in close proximity to each side of said fire-box and having an inlet in communication with the atmosphere at the. forward end of said casing, the opposite end of each conduit projecting beyond said bridge-wall and formed with a plurality of nozzles substantially in alinement with the adjacent side walls of said fire-box, a combustion chamber extending from said bridge-wall including a restricted channel into which said nozzles empty, means manipulatable at the forward end of said casing normally holding said door closed, and a shutter connected to said means for closing the inlet of each air conduit, said means actuatable to open said door whereupon said. shutters will simultaneously uncover said inlets.

3. A device of the class described comprising a casing, a fuel-chamber mounted therein and having a closure at one end, a bridge wall bearing upon the other end and including a restricted channel in the line of passage of the products of'combustion, continuous air conduits positioned adjacent to. and heated solely from said fuel chamber, one end of each conduit communicating exteriorly of said casing at its forward end, a combustion chamber into which said restricted channel discharges, nozzles carried at the opposite ends of said conduits spaced apart and emptying into said channel, mechanism normally barring the closure of said fuel chamber and adapted to control the intake of each conduit simultaneously, and a handle for actuating said mechanism, said closure being disengaged when said mechanism is actuated.

4. Adevice of the kind described comprising a casing, a fuel chamber mounted therein and having a door at one end and a bridge-wall bearing upon its opposite end forming a restricted channel in continuation thereof, a combustion chamber surrounding said channel, continuous air conduits divergingly opening into the atmosphere at the front of said casing, and convergingly-extending past said bridge-wall, each conduit positioned adjacent to and heated solely from said fuel chamber and provided with spaced outlets diametrically opposite and emptying into said restricted channel, a shutter closing the intake opening of each conduit and working in vertical guideways on each side of said door, a vertically-disposed and slidable member connected to each shutter, a link for reciprocating said members and means normally barring said door, said link arranged to uncover said lastmentioned openings and simultaneously to forward end and a combustion chamber at the, rear end thereof communicating with each other, air conduits located above the ash-pit within the heating range of the firebox, means for controlling the admission of air to said conduits, and'aretarding device for said means, the combination of a bridgewall bearing at the rear end of said firebox, the forward end of said framework extending inwardly and downwardly from its center, a closure for said fire-box intermediate the ends of said inward extension, a restricted channel formed by said bridgewall opening into said combustion chamber, a plurality of spacednozzles formed upon each conduit and opening into said channel at diametrically opposite sides and a tilting link having a flange bearing upon said 010- sure to prevent its movement, said link actuated by said means to allow said movement.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

JOHANNES KAUTH. Witnesses:

LOUIS Gonmi, JEAN GRUND.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

